KR20050086879A - Hydraulic hose fitting and method - Google Patents

Abstract

The present invention is an improved hydraulic fitting (10) of the type having a stem (12) including a hose insert portion, and a collar support portion. The fitting further has a mating connection portion, and a collar (16) having, a torque communication portion (18), a ferrule support portion, and an inner periphery extending through the ferrule support portion and the torque communication portion. The fitting is improved by the collar support portion including knurling (40) and an axial stop ring (28). Further, the torque communication portion (18) of the collar (16) is staked such that the inner periphery extending through the torque communication portion (18) communicates with the knurling (40) of the collar support portion of the stem in a relatively non-rotational manner. Also, the ferrule support portion of the collar (16) is staked such that the inner periphery extending through the ferrule support portion communicates with the axial stop ring (28) of the stem (12) in an axial movement limiting manner.

Description

HYDRAULIC HOSE FITTING AND METHOD}

The present invention relates generally to hydraulic tube-hose couplings. More specifically, the invention relates to hose end fittings of such couplings. In particular, the present invention relates to an improved collar and collar support at a hose end fitting of a tube-hose coupling.

Hydraulic couplings are known. The hose connection or fitting may have a pipe or stem portion, a collar and, optionally, a ferrule. The collar is fitted around the middle region of the tube portion and pressed or staked to attach in place. If there is a ferrule, the ferrule can also be staked around a portion of the collar to attach in place. The tubular portion has a hose insert, which is inserted into the open end of the hose. The ferrule is then squeezed or crimped around the end of the hose containing the insert that constrains the hose between the ferrule and the hose insert. This allows all parts to be permanently sealed or fixed so that the end of the hose cannot be axially moved or rotated. Hose connection fittings may also have numerous types of mating connections, including threaded, press-fitted, male and female. The construction of certain mating connections necessitates the use of collars to enable the manufacture of associated fittings. Coupling with these mating connections and joints connected to the target fixture, machinery or equipment, a specific hydraulic assembly is achieved that allows for fluid delivery of the fluid.

In fittings with threaded engagement connections, the collar typically has a flat surface for wrenches to stabilize the rotation of the fitting when the engagement connection is tightened to complete engagement with the corresponding portion of the fixture fitting. Ferrules are included in structures where the fittings and hoses operate under heavy axial loads that can impose high operating pressures or tensile loads on the hoses.

Currently, there is a stake collar design that supports significant longitudinal loads while maintaining ferrules in the hose end fittings of the coupling. However, this collar structure will rotate relative to the stem even at fairly low torque values. This collar structure is staked on only one side of the collar. Also, conventionally, the knurling portion has been used with internal splines on the collar to withstand high torques. However, such a structure could not be used under high axial loads, and ferrules were needed because they would not be able to support such high axial loads. This collar structure is also staked on only one side of the collar. It is also known to braze the collar to the stem. This creates a manufacturing difficulty in employing brazing, even though it creates a seam with a very sturdy color, and concomitantly increases and complicates the manufacturing cost.

Thus, both the resistance to twisting against the stem of the collar when torque is applied to the wrench bite of the collar and the improvement in both the axial displacement characteristics of the stem when the force is applied by a ferrule that reacts to the force applied to the hose. There is a continuing need for hydraulic fittings with distinct collars that achieve without the drawbacks including brazing.

1 is a perspective view of a hydraulic fitting of a preferred embodiment,

2 is a view showing a state in which the hydraulic fitting of the preferred embodiment is cut in 1/4,

3 is a perspective view showing the stem of the hydraulic fitting in the preferred embodiment,

4 is a view showing a state in which 1/4 of the stem of the preferred embodiment cut off,

5 is a perspective view showing the collar of the hydraulic fitting in the preferred embodiment,

6 is a view showing a state in which 1/4 of the collar of the preferred embodiment is cut away,

7 is a view showing a state in which 1/4 is cut in a preferred embodiment of a hydraulic fitting including a staking die;

8 is a view showing a state in which 1/4 of another preferred embodiment of a hydraulic fitting including a ferrule and a staking die is cut out,

It is a figure which shows the state which cut | disconnected 1/4 the hydraulic fitting of another preferred embodiment.

The invention provides an improved hydraulic pressure combination of properties including resistance properties against twisting against the stem of the collar when torque is applied to the wrench bite of the collar and axial displacement characteristics against the stem when loaded by the hose. The purpose is to provide a fitting.

The present invention is an improved hydraulic fitting of the type having a stem with a hose insert and a collar support. Such fittings further have a coupling connection and a collar, the collar having a torque transmission, a ferrule support and an inner circumference extending through these torque transmission and ferrule supports. The fitting is improved by a collar support having a knurled portion and an axial stop ring. Moreover, the torque transmission part of the collar is staking so that the inner peripheral part which extends through this torque transmission part cooperates so that it may not rotate relative to the knurling part in the collar support part of the said stem. Further, the ferrule support of the collar is staked such that the inner circumference extending through the ferrule support cooperates to limit the axial movement of the stem with the axial stop ring.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and form a part, and wherein like numerals refer to like parts, illustrate the preferred embodiments of the invention together with the description, and serve to explain the principles of the invention.

1 and 2, the hydraulic hose fitting 10 of one preferred embodiment includes a stem 12 with a barb 14 having a flat portion 18 for wrenches thereon. The collar 16 is arranged. On the stem 12 is also arranged a nut 20 with a nut contact 44. The process of staking the collar 16 on the stem 12 leaves a staking mark 22. 3 and 4 show the stem 12 in more detail. Specifically, the knurled portion 24, the axial stop ring 26, the assembly stop ring 28, the inclined surface 30 and the stem contact portion 32 can be identified. In Figures 5 and 6 the collar 16 is shown in more detail. Specifically, the ferrule press-fit portion 34, the axial retaining ridge 36, the assembly ridge 38, the knurled portion engaging surface 40 and the free surface 42 can be confirmed. It can be seen that the collar 16 has a torque transmission part D and a ferrule support part E. FIG.

Assembly of the preferred embodiment places the nut 20 on the stem 12 such that the nut contact 44 is proximate or adjacent to the stem contact 32 as shown. The collar 16 is then placed on the stem 12 such that the assembly ridge 38 abuts against the assembly stop ring 28. The assembly stop ring 28 is optional. In some cases, similarly, the difference between the diameter of the barb 14 and the diameter of the stem portion with the knurled portion 24 is such that the assembly stop ring 28 can be distinguished. The assembly stop ring 28 can be utilized and, where distinguished, the assembly stop ring 28 and the assembly ridge 38 with the aid of the inclined surface 30 have a collar 16 on the stem 12. It provides a convenient baseline for positioning. Referring to FIG. 7, the three parts once assembled in this manner are placed in a swaging tool of conventional construction (not shown) with a plurality of staking dies 46. For the fittings shown, there are typically eight staking dies in total. The swaging tool presses the staking die 46 against the collar 16 with an appropriate force on both sides of the wrench flat portion 18, and as shown in Fig. 2, the axial holding ridge 36 is axially oriented. The diameter 16 is smaller than the stop ring 26 and the collar 16 is squeezed to the point where the knurled portion engaging surface 40 is forced against the knurled portion 34. This operation is evidenced by the staking marks 22 left behind. In this one operation, the nut 20 is trapped on the stem 12 and the collar 16 has a high resistance to rotation on the stem 12 and a high resistance to axial separation. It is fixed to). As a result of this, hydraulic hose fittings are assembled very efficiently and not only for applications that require significant torque to the hydraulic hose fittings while engaging the joints of a given device, but also for applications that receive significant axial loads during use. Very hardy.

It can be seen that the fitting has a hose insert (A), a collar support (B) and a coupling connection (C). In use, the hose insert A of the fitting 10 is inserted into the open end of a hydraulic hose (not shown). This hose is clamped to seal it in place. To maximize the resistance of the hose to axial separation from the fitting 10, the ferrule 48 is used to do this function. First, the ferrule 48 may be staked on the collar 16 at the ferrule press-in portion 34 of the ferrule support E. FIG. Ferrule 48 will then be crimped around the connecting end of the hose. Ferrule 48 may be crimped on collar 16 prior to, after or during crimping the hose. Completion of the oil tight connection entails attaching to certain machines or other devices (not shown). Such a machine or device has a joint (not shown) of that machine or device that engages the fitting 10. The nut 20 of the mating connection C will be screwed into the joint of the device. The tightening operation applies a tightening torque by clamping the wrench into the nut 20 and stabilizing torque to prevent the wrench or the fitting 10 in the hose from twisting by clamping the wrench into the flat portion 18 for the wrench. This involves applying to the stem 12. The present invention makes it possible to apply very significant stabilizing torques that have not been applicable so far in fittings with collars 16 separated from stem 12 and to support significant axial loads.

This preferred embodiment has a free face 42 on the collar 16. This simplifies the staking process by eliminating the need for a staking die of six fingers of non-standard type and the need for indexing with respect to the flats 18 for wrenches. In some cases, the free surface also increases the space that allows the nut 20 to retract and release from the male screw of the seam (not shown) of the device or machine. However, the staking mark 22 can be visually confirmed by the torque transmission part D, and can be made unsightly.

Another preferred embodiment is shown in FIGS. 8 and 9. In this embodiment, the collar 18 does not have a free face 42. Thus, the space in which the nut 20 can move when loosening the nut is limited for any given total length at the fitting 10. This has the advantage that the staking process can be applied to the flat portion 18 for wrenches, which can have a sufficient area not to leave unsighted staking marks 22. However, a staking die of six fingers of non-standard type is required. 8 shows the fitting 10 just before the staking process, which has a ferrule 48 arranged for staking. 9 shows the fitting 10 after the staking is completed. As in the previous embodiment, this embodiment can be manufactured with or without ferrules 48.

The true result of the present invention is a hydraulic fitting with a collar that can withstand significant torque and axial forces against the stem and does not require brazing at the time of manufacture.

The foregoing description and illustrated embodiments of the present invention are illustrated in the drawings, and various modifications and variations have been described in detail. However, it should be understood that the foregoing description of the invention is for illustration only, and the scope of the invention is limited only by the claims, which are interpreted in consideration of the prior art. In addition, the invention disclosed herein by way of example may be practiced without the presence of certain elements not specifically described herein.

Claims (6)

An improved hydraulic fitting of the type having a stem with a hose insert and a collar support, the fitting having a mating connection and a collar, the collar having a torque transmission, a ferrule support and the torque transmission and the ferrule support. There is an inner circumference extending through, The collar support comprises a knurled portion and an axial stop ring, The torque transmitting portion is staking such that the inner circumference extending through the torque transmitting portion cooperates with the knurling portion so as not to rotate relative thereto. And the ferrule support is staked such that the inner circumference extending through the ferrule support cooperates to limit axial movement with the axial stop ring. A stem having a hose insert and a collar support, With mating connections, A collar having a torque transmission portion, a ferrule support portion and an inner circumference extending through the torque transmission portion and the ferrule support portion. Wherein the collar support includes a knurled portion and an axial stop ring, The torque transmission portion is staked such that the inner circumference extending through the torque transmission portion cooperates with the knurling portion so as not to rotate relative, And the ferrule support is staked such that the inner circumference extending through the ferrule support cooperates to limit axial movement with the axial stop ring. 3. The hydraulic fitting of claim 2 further comprising a ferrule secured on said ferrule support. A hydraulic coupling and hose comprising a hose end fitting and a device joint, The hose end fitting, A stem having a hose insert and a collar support, said collar support having a knurled portion and an axial stop ring; A collar having a torque transmission portion, a ferrule support portion and an inner circumference portion extending through the torque transmission portion and the ferrule support portion, wherein the torque transmission portion extends relative to the knurling portion and extends through the torque transmission portion. A collar which is staking to cooperate indefinitely, wherein the ferrule support is staking such that the inner circumference extending through the ferrule support cooperates to limit axial movement with the axial stop ring; Mating connection Wherein the hose is fitted on the hose end fitting, And the device coupling sealably engages with a mating connection of the hose end fitting.  5. The hydraulic coupling and hose of claim 4 further comprising a ferrule staking on the ferrule support, wherein the hose is crimped under the ferrule. A method of producing hydraulic fittings, Providing a stem having a hose insert and a collar support, Knurling a portion of the collar support; Forming an annular indentation in proximity to a common boundary between the collar and the hose insert How to include.